If he attempted to declare ‘ex cathedra’ something so obviously incompatible with the Old and New Testaments, as well as 2,000 years of Catholic doctrine, he would be a manifest heretic.
“If he attempted to declare ‘ex cathedra’ something so obviously incompatible with the Old and New Testaments, as well as 2,000 years of Catholic doctrine, he would be a manifest heretic.”
I would think so, but still, if he has the power to sit in Peter’s recliner and declare revelation, it would not be heresy. It would be divine revelation... one would think.
This raises an additional question - perhaps for a different thread...
If a pope can declare something true by virtue of revelation, why doesn’t Rome update their version of the Scriptures to include this revelation?